Step 4: Device in action

Heart rate is a very vital health parameter that is directly related to the soundness of the human cardiovascular system. This project describes a technique of measuring the heart rate through a fingertip using a PIC microcontroller. While the heart is beating, it is actually pumping blood throughout the body, and that makes the blood volume inside the finger artery to change too. This fluctuation of blood can be detected through an optical sensing mechanism placed around the fingertip. The signal can be amplified further for the microcontroller to count the rate of fluctuation, which is actually the heart rate.

Step 1: Sensor assembly

The sensor unit consists of an infrared light-emitting-diode (IR LED) and a photo diode, placed side by side, and the fingertip is placed over the sensor assembly, as shown below. The IR LED transmits an infrared light into the fingertip, a part of which is reflected back from the blood inside the finger arteries. The photo diode senses the portion of the light that is reflected back. The intensity of reflected light depends upon the blood volume inside the fingertip. So, every time the heart beats the amount of reflected infrared light changes, which can be detected by the photo diode. With a high gain amplifier, this little alteration in the amplitude of the reflected light can be converted into a pulse.

An elderly person measures his heart rate routinely and based on the result,an automatic voice instruction has to be given to the person like example,your heart rate is normal(70-90),if in range 40-65 something,if above 100 something,

the 1st challenge:the person would measure for every 2 hour,only then the sensor should get activated.

An elderly person measures his heart rate routinely and based on the result,an automatic voice instruction has to be given to the person like example,your heart rate is normal(70-90),if in range 40-65 something,if above 100 something,

the 1st challenge:the person would measure for every 2 hour,only then the sensor should get activated.

An elderly person measures his heart rate routinely and based on the result,an automatic voice instruction has to be given to the person like example,your heart rate is normal(70-90),if in range 40-65 something,if above 100 something,

the 1st challenge:the person would measure for every 2 hour,only then the sensor should get activated.

Interesting project, good work. I am disappointed by the comments below. Your project was clear and easy to follow and any modifications would be very simple. The sheer number of "final year electrical engineering students" who can't figure out what you did is appalling! This is all very basic circuitry that has been very clearly presented. To all you students, experiment! You will learn a lot and really understand the principles you've learned in school.

hello,my self syed faizan kazmi,EE dept, final year wants to built this project as my major project so can you please send me the entire things used...like ckt dig,programming code and apparatus required..... urgent please send ASAP...